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Selection of the outlet boundary condition

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Old   July 18, 2014, 02:27
Default Selection of the outlet boundary condition
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Mirage
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Hello OF-Users

I am trying to simulate a distribution of a incompressible fluid between different two spaces and I am not sure, how should I set up the boundary condition of the outlet.

The velocity for the inlet-flow is 1 m/s , and the with of inlet-face is 2 units.
the width of the outlet-faces is 42 units


I used this BC for the outlet:
for p :

Code:
    outlet
    {
        type            fixedValue;
        value          0;
    }
for U

Code:
   outlet
    {
        type            zeroGradient;
    }
but i did get any physical results and the solver "simpleFoam" dumped after 70 sec simulation-time.

So that is why I tried to use the conservation of the mass to define the flow velocity in the outlet (0,047619 m/s) ... and I defined the pressures BC as zeroGradient ..but ... It did not help either..

In the attachment is a screen-shot of the physical domain.
the fluid comes from left and go out from the right side.

Any suggestion?
Any help will be appreciated!

Last edited by Mirage; July 21, 2014 at 05:10.
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